1 /* $OpenBSD: p_open.c,v 1.19 2017/05/02 03:59:44 deraadt Exp $ */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <stdio.h>
60 #include <string.h>
61
62 #include <openssl/opensslconf.h>
63
64 #ifndef OPENSSL_NO_RSA
65
66 #include <openssl/err.h>
67 #include <openssl/evp.h>
68 #include <openssl/objects.h>
69 #include <openssl/rsa.h>
70 #include <openssl/x509.h>
71
72 int
EVP_OpenInit(EVP_CIPHER_CTX * ctx,const EVP_CIPHER * type,const unsigned char * ek,int ekl,const unsigned char * iv,EVP_PKEY * priv)73 EVP_OpenInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type,
74 const unsigned char *ek, int ekl, const unsigned char *iv, EVP_PKEY *priv)
75 {
76 unsigned char *key = NULL;
77 int i, size = 0, ret = 0;
78
79 if (type) {
80 EVP_CIPHER_CTX_init(ctx);
81 if (!EVP_DecryptInit_ex(ctx, type, NULL, NULL, NULL))
82 return 0;
83 }
84
85 if (!priv)
86 return 1;
87
88 if (priv->type != EVP_PKEY_RSA) {
89 EVPerror(EVP_R_PUBLIC_KEY_NOT_RSA);
90 goto err;
91 }
92
93 size = RSA_size(priv->pkey.rsa);
94 key = malloc(size + 2);
95 if (key == NULL) {
96 /* ERROR */
97 EVPerror(ERR_R_MALLOC_FAILURE);
98 goto err;
99 }
100
101 i = EVP_PKEY_decrypt_old(key, ek, ekl, priv);
102 if ((i <= 0) || !EVP_CIPHER_CTX_set_key_length(ctx, i)) {
103 /* ERROR */
104 goto err;
105 }
106 if (!EVP_DecryptInit_ex(ctx, NULL, NULL, key, iv))
107 goto err;
108
109 ret = 1;
110
111 err:
112 freezero(key, size);
113 return (ret);
114 }
115
116 int
EVP_OpenFinal(EVP_CIPHER_CTX * ctx,unsigned char * out,int * outl)117 EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
118 {
119 int i;
120
121 i = EVP_DecryptFinal_ex(ctx, out, outl);
122 if (i)
123 i = EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL);
124 return (i);
125 }
126 #endif
127